You could source a very good secondhand upright around the budget you mention if you have time to be patient and look around.
I understand it may be different to what you are wanting, needing, expecting etc but there is no substitute for that real piano sound, not to mention it will do wonders for your technique if you are progressing with your learning.
I could add a whole lot more but thought I'd keep it short for now in case it's not something that interests you or is appropriate to what you want etc. Well I'm fairly sure you've now made a decision. I wrote this awhile back on a blog expressly for those looking at buying a new keyboard. I hope it helps someone.
The article is titled " Buying A Keyboard".
www.recordinghound.com
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